2 *------------------------------------------------------------------
3 * Copyright (c) 2016 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
21 #include <sys/ioctl.h>
24 #include <vlib/vlib.h>
25 #include <vlib/unix/unix.h>
26 #include <vnet/ethernet/ethernet.h>
28 #include <memif/memif.h>
29 #include <memif/private.h>
31 #define foreach_memif_tx_func_error \
32 _(NO_FREE_SLOTS, "no free tx slots") \
33 _(PENDING_MSGS, "pending msgs in tx ring")
37 #define _(f,s) MEMIF_TX_ERROR_##f,
38 foreach_memif_tx_func_error
41 } memif_tx_func_error_t;
43 static char *memif_tx_func_error_strings[] = {
45 foreach_memif_tx_func_error
50 format_memif_device_name (u8 * s, va_list * args)
52 u32 i = va_arg (*args, u32);
54 s = format (s, "memif%u", i);
59 format_memif_device (u8 * s, va_list * args)
61 u32 dev_instance = va_arg (*args, u32);
62 int verbose = va_arg (*args, int);
63 uword indent = format_get_indent (s);
65 s = format (s, "MEMIF interface");
68 s = format (s, "\n%U instance %u", format_white_space, indent + 2,
75 format_memif_tx_trace (u8 * s, va_list * args)
77 s = format (s, "Unimplemented...");
81 static_always_inline void
82 memif_prefetch_buffer_and_data (vlib_main_t * vm, u32 bi)
84 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
85 vlib_prefetch_buffer_header (b, LOAD);
86 CLIB_PREFETCH (b->data, CLIB_CACHE_LINE_BYTES, LOAD);
89 static_always_inline uword
90 memif_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
91 vlib_frame_t * frame, memif_if_t * mif,
92 memif_ring_type_t type)
96 u32 *buffers = vlib_frame_args (frame);
97 u32 n_left = frame->n_vectors;
101 u32 thread_index = vlib_get_thread_index ();
102 u8 tx_queues = vec_len (mif->tx_queues);
105 if (tx_queues < vec_len (vlib_mains))
107 qid = thread_index % tx_queues;
108 clib_spinlock_lock_if_init (&mif->lockp);
114 mq = vec_elt_at_index (mif->tx_queues, qid);
116 ring_size = 1 << mq->log2_ring_size;
117 mask = ring_size - 1;
119 /* free consumed buffers */
125 free_slots = tail - head;
127 free_slots = ring_size - head + tail;
129 while (n_left > 5 && free_slots > 1)
131 if (PREDICT_TRUE (head + 5 < ring_size))
133 CLIB_PREFETCH (memif_get_buffer (mif, ring, head + 2),
134 CLIB_CACHE_LINE_BYTES, STORE);
135 CLIB_PREFETCH (memif_get_buffer (mif, ring, head + 3),
136 CLIB_CACHE_LINE_BYTES, STORE);
137 CLIB_PREFETCH (&ring->desc[head + 4], CLIB_CACHE_LINE_BYTES, STORE);
138 CLIB_PREFETCH (&ring->desc[head + 5], CLIB_CACHE_LINE_BYTES, STORE);
142 CLIB_PREFETCH (memif_get_buffer (mif, ring, (head + 2) % mask),
143 CLIB_CACHE_LINE_BYTES, STORE);
144 CLIB_PREFETCH (memif_get_buffer (mif, ring, (head + 3) % mask),
145 CLIB_CACHE_LINE_BYTES, STORE);
146 CLIB_PREFETCH (&ring->desc[(head + 4) % mask],
147 CLIB_CACHE_LINE_BYTES, STORE);
148 CLIB_PREFETCH (&ring->desc[(head + 5) % mask],
149 CLIB_CACHE_LINE_BYTES, STORE);
152 memif_prefetch_buffer_and_data (vm, buffers[2]);
153 memif_prefetch_buffer_and_data (vm, buffers[3]);
155 vlib_buffer_t *b0 = vlib_get_buffer (vm, buffers[0]);
156 vlib_buffer_t *b1 = vlib_get_buffer (vm, buffers[1]);
158 void *mb0 = memif_get_buffer (mif, ring, head);
159 clib_memcpy (mb0, vlib_buffer_get_current (b0), CLIB_CACHE_LINE_BYTES);
160 ring->desc[head].length = b0->current_length;
161 head = (head + 1) & mask;
163 void *mb1 = memif_get_buffer (mif, ring, head);
164 clib_memcpy (mb1, vlib_buffer_get_current (b1), CLIB_CACHE_LINE_BYTES);
165 ring->desc[head].length = b1->current_length;
166 head = (head + 1) & mask;
168 if (b0->current_length > CLIB_CACHE_LINE_BYTES)
170 clib_memcpy (mb0 + CLIB_CACHE_LINE_BYTES,
171 vlib_buffer_get_current (b0) + CLIB_CACHE_LINE_BYTES,
172 b0->current_length - CLIB_CACHE_LINE_BYTES);
174 if (b1->current_length > CLIB_CACHE_LINE_BYTES)
176 clib_memcpy (mb1 + CLIB_CACHE_LINE_BYTES,
177 vlib_buffer_get_current (b1) + CLIB_CACHE_LINE_BYTES,
178 b1->current_length - CLIB_CACHE_LINE_BYTES);
187 while (n_left && free_slots)
189 vlib_buffer_t *b0 = vlib_get_buffer (vm, buffers[0]);
190 void *mb0 = memif_get_buffer (mif, ring, head);
191 clib_memcpy (mb0, vlib_buffer_get_current (b0), CLIB_CACHE_LINE_BYTES);
193 if (b0->current_length > CLIB_CACHE_LINE_BYTES)
195 clib_memcpy (mb0 + CLIB_CACHE_LINE_BYTES,
196 vlib_buffer_get_current (b0) + CLIB_CACHE_LINE_BYTES,
197 b0->current_length - CLIB_CACHE_LINE_BYTES);
199 ring->desc[head].length = b0->current_length;
200 head = (head + 1) & mask;
207 CLIB_MEMORY_STORE_BARRIER ();
210 clib_spinlock_unlock_if_init (&mif->lockp);
214 vlib_error_count (vm, node->node_index, MEMIF_TX_ERROR_NO_FREE_SLOTS,
216 vlib_buffer_free (vm, buffers, n_left);
219 vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors);
220 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0 && mq->int_fd > -1)
223 CLIB_UNUSED (int r) = write (mq->int_fd, &b, sizeof (b));
227 return frame->n_vectors;
231 memif_interface_tx (vlib_main_t * vm,
232 vlib_node_runtime_t * node, vlib_frame_t * frame)
234 memif_main_t *nm = &memif_main;
235 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
236 memif_if_t *mif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
238 if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
239 return memif_interface_tx_inline (vm, node, frame, mif, MEMIF_RING_S2M);
241 return memif_interface_tx_inline (vm, node, frame, mif, MEMIF_RING_M2S);
245 memif_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
248 memif_main_t *apm = &memif_main;
249 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
250 memif_if_t *mif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
252 /* Shut off redirection */
253 if (node_index == ~0)
255 mif->per_interface_next_index = node_index;
259 mif->per_interface_next_index =
260 vlib_node_add_next (vlib_get_main (), memif_input_node.index, node_index);
264 memif_clear_hw_interface_counters (u32 instance)
266 /* Nothing for now */
269 static clib_error_t *
270 memif_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
271 vnet_hw_interface_rx_mode mode)
273 memif_main_t *mm = &memif_main;
274 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
275 memif_if_t *mif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
276 memif_queue_t *mq = vec_elt_at_index (mif->rx_queues, qid);
278 if (mode == VNET_HW_INTERFACE_RX_MODE_POLLING)
279 mq->ring->flags |= MEMIF_RING_FLAG_MASK_INT;
281 mq->ring->flags &= ~MEMIF_RING_FLAG_MASK_INT;
286 static clib_error_t *
287 memif_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
289 memif_main_t *mm = &memif_main;
290 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
291 memif_if_t *mif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
292 static clib_error_t *error = 0;
294 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
295 mif->flags |= MEMIF_IF_FLAG_ADMIN_UP;
297 mif->flags &= ~MEMIF_IF_FLAG_ADMIN_UP;
302 static clib_error_t *
303 memif_subif_add_del_function (vnet_main_t * vnm,
305 struct vnet_sw_interface_t *st, int is_add)
307 /* Nothing for now */
312 VNET_DEVICE_CLASS (memif_device_class) = {
314 .tx_function = memif_interface_tx,
315 .format_device_name = format_memif_device_name,
316 .format_device = format_memif_device,
317 .format_tx_trace = format_memif_tx_trace,
318 .tx_function_n_errors = MEMIF_TX_N_ERROR,
319 .tx_function_error_strings = memif_tx_func_error_strings,
320 .rx_redirect_to_node = memif_set_interface_next_node,
321 .clear_counters = memif_clear_hw_interface_counters,
322 .admin_up_down_function = memif_interface_admin_up_down,
323 .subif_add_del_function = memif_subif_add_del_function,
324 .rx_mode_change_function = memif_interface_rx_mode_change,
327 VLIB_DEVICE_TX_FUNCTION_MULTIARCH(memif_device_class,
332 * fd.io coding-style-patch-verification: ON
335 * eval: (c-set-style "gnu")